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How are oceans born? 新闻
来源平台：CNRS News. 发布日期：2021
作者:  admin
收藏  |  浏览/下载：3/0  |  提交时间：2021/11/15
Breaking Earth's shell into a global plate network 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Tang, C. A.;  Webb, A. A. G.;  Moore, W. B.;  Wang, Y. Y.;  Ma, T. H.;  Chen, T. T.
收藏  |  浏览/下载：10/0  |  提交时间：2020/07/21
Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen 期刊论文
NATURE, 2020, 580 (7803) : 367-+
作者:  Zhao, Steven;  Jang, Cholsoon;  Liu, Joyce;  Uehara, Kahealani;  Gilbert, Michael;  Izzo, Luke;  Zeng, Xianfeng;  Trefely, Sophie;  Fernandez, Sully;  Carrer, Alessandro;  Miller, Katelyn D.;  Schug, Zachary T.;  Snyder, Nathaniel W.;  Gade, Terence P.;  Titchenell, Paul M.;  Rabinowitz, Joshua D.;  Wellen, Kathryn E.
收藏  |  浏览/下载：14/0  |  提交时间：2020/05/13

Nitrogen is the main constituent of the Earth'  s atmosphere, but its provenance in the Earth'  s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth'  s accretion versus that subducted from the Earth'  s surface is unclear(1-6). Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare (NN)-N-15-N-15 isotopologue of N-2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle delta N-15 (the fractional difference in N-15/N-14 from air), N-2/Ar-36 and N-2/He-3. Our results show that negative delta N-15 values observed in gases, previously regarded as indicating a mantle origin for nitrogen(7-10), in fact represent dominantly air-derived N-2 that experienced N-15/N-14 fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the (NN)-N-15-N-15 data allow extrapolations that characterize mantle endmember delta N-15, N-2/Ar-36 and N-2/He-3 values. We show that the Eifel region has slightly increased delta N-15 and N-2/Ar-36 values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts(11), consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has delta N-15 values substantially greater than that of the convective mantle, resembling surface components(12-15), its N-2/Ar-36 and N-2/He-3 ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume delta N-15 values may both be dominantly primordial features.


  
Primordial and recycled helium isotope signatures in the mantle transition zone 期刊论文
SCIENCE, 2019, 365 (6454) : 692-+
作者:  Timmerman, S.;  Honda, M.;  Burnham, A. D.;  Amelin, Y.;  Woodland, S.;  Pearson, D. G.;  Jaques, A. L.;  Le Losq, C.;  Bennett, V. C.;  Bulanova, G. P.;  Smith, C. B.;  Harris, J. W.;  Tohver, E.
收藏  |  浏览/下载：7/0  |  提交时间：2019/11/27
Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (27) : 13227-13232
作者:  Glisovic, Petar;  Forte, Alessandro M.
收藏  |  浏览/下载：9/0  |  提交时间：2019/11/27
mantle plumes  North Atlantic Igneous Province  time-reversed mantle convection  
Titanium isotopes as a tracer for the plume or island arc affinity of felsic rocks 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (4) : 1132-1135
作者:  Deng, Zhengbin;  Chaussidon, Marc;  Savage, Paul;  Robert, Francois;  Pik, Raphael;  Moynier, Frederic
收藏  |  浏览/下载：7/0  |  提交时间：2019/11/27
titanium isotopes  plume  island arc  magma differentiation  plate tectonics  
Recycled ancient ghost carbonate in the Pitcairn mantle plume 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2018, 115 (35) : 8682-8687
作者:  Wang, Xiao-Jun;  Chen, Li-Hui;  Hofmann, Albrecht W.;  Hanyu, Takeshi;  Kawabata, Hiroshi;  Zhong, Yuan;  Xie, Lie-Wen;  Shi, Jin-Hua;  Miyazaki, Takashi;  Hirahara, Yuka;  Takahashi, Toshiro;  Senda, Ryoko;  Chang, Qing;  Vaglarov, Bogdan S.;  Kimura, Jun-Ichi
收藏  |  浏览/下载：11/0  |  提交时间：2019/11/27
Pitcairn mantle plume  EM1  magnesium isotopes  ancient carbonate-bearing sediments  
Chemical trends in ocean islands explained by plume-slab interaction 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2018, 115 (17) : 4351-4356
作者:  Dannberg, Juliane;  Gassmoller, Rene
收藏  |  浏览/下载：5/0  |  提交时间：2019/11/27
mantle plumes  hotspots  bilateral zoning  geodynamic modeling  plume generation zones  
Redox variations in Mauna Kea lavas, the oxygen fugacity of the Hawaiian plume, and the role of volcanic gases in Earth's oxygenation 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2017, 114 (34) : 8997-9002
作者:  Brounce, Maryjo;  Stolper, Edward;  Eiler, John
收藏  |  浏览/下载：5/0  |  提交时间：2019/11/27
ocean island basalts  oxygen fugacity  Hawaii volcanism  volcanic degassing  Great Oxidation Event  
Seismic evidence for partial melting at the root of major hot spot plumes 期刊论文
SCIENCE, 2017, 357 (6349) : 393-396
作者:  Yuan, Kaiqing;  Romanowicz, Barbara
收藏  |  浏览/下载：1/0  |  提交时间：2019/11/27